package xty.util;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.util.Map;

/**
 * Created by XieTianYi on 2018/12/17.
 */
@Component("springBeanUtil")
public class SpringBeanUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name) {
        return applicationContext.getBean(name);
    }

    //通过class获取 Bean.
    public static <T> Map<String, T> getBeansOfType(Class<T> clazz) {
        return applicationContext.getBeansOfType(clazz);
    }

    //通过class获取 Bean.
    public static <T extends Annotation> Map<String, Object> getBeansWithAnnotation(Class<T> clazz) {
        return applicationContext.getBeansWithAnnotation(clazz);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz) {
        return applicationContext.getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (SpringBeanUtil.applicationContext == null) {
            SpringBeanUtil.applicationContext = applicationContext;
        }
    }
}
